An X-linked carrier is a
a. homozygous dominant female.
b. heterozygous female.
c. homozygous recessive female.
d. homozygous male.
e. heterozygous male
B
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The five steps listed below are part of the cross-bridge cycle
1. The myosin head binds to actin. 2. The myosin head is cocked back through the hydrolysis of ATP. 3. The actin filament slides relative to the myosin filament. 4. The myosin head binds ATP. 5. The myosin head detaches from the actin. Which of the following lists the steps in the correct order? A. 4, 5, 2, 1, 3 B. 1, 4, 2, 3, 5 C. 1, 2, 3, 4, 5 D. 5, 4, 1, 2, 3 E. 2, 1, 3, 5, 4
Which of the following statements accurately describes transcription by RNA polymerase?
A. RNA polymerase simultaneously transcribes both strands of DNA B. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5’ to 3’ direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 3’ to 5’ direction, producing two identical transcripts C. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5’ to 3’ direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 5’ to 3’ direction, producing two identical transcripts D. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5’ to 3’ direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 3’ to 5’ direction, producing two different transcripts E. It is possible for one RNA polymerase to transcribe one strand of DNA in the 5’ to 3’ direction and another RNA polymerase to transcribe the complimentary strand of DNA in the 5’ to 3’ direction, producing two different transcripts
Many insects, like moths and flies, undergo complete metamorphosis. What would you predict about gene expression in these two kinds of insects?
A. The same genes are expressed at each stage, but the age and number of cells accounts for the minor morphological differences. B. The basic organization of homeotic genes is the same in both larvae and adult, but the expression of some other genes must be different. C. Completely different sets of genes must be used in the development of larvae and the adult. D. The order of homeotic genes along the body axis must be different in larvae and adult.
Which is the true statement about vaginosis and vaginitis?
A) Vaginitis describes vaginal inflammation while vaginosis does not. B) Vaginitis is always due to microbiome dysbiosis. C) The two conditions are always seen together. D) The two conditions are always mutually exclusive. E) Vaginosis is not likely to be sexually transmitted.